As somebody that was using Windows XP up to its EoL, I am fairly certain I was in the minority (at least amongst home users.) I don't think anybody I knew was using XP by the time its end came. The only reason I was still on it at the time was a complete lack of income which meant using very old hand-me-down hardware.
The situation with Windows 10 feels quite different, because most people I know that use Windows are on Windows 10 currently.
I was working at a web design company a little after windows XP went EoL. One site had a member on thier board who kept raising a stink because the redesigned site didn't work right on their computer. Found out that they were using IE6 or whatever on XP. Our estimate for the fix was $600, which was like an additional 2-3% on top of the original estimate so it was approved. The $600 was used to buy a new laptop for that board member with Windows7 and whatever the latest IE was installed.
The situation with Windows 10 feels quite different, because most people I know that use Windows are on Windows 10 currently.